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WPAN Platform과 레고 마인드스톰 NXT를 이용한 원격제어 로봇 개발에 대한 연구
이민철 ( Min-cheol Lee ),송영호 ( Young-ho Song ),이영철 ( Young-chul Lee ),김인환 ( In-hwan Kim ),정구민 ( Gu-min Jeong ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1
본 논문에서는 휴대폰과 LEGO Mindstorms NXT를 이용한 원격제어로봇 개발 모델을 제안하고 이를 기반으로 원격제어 로봇을 설계하였다. 제안하는 원격제어로봇 개발 방법은 LEGO Mindstorms NXT를 이용한 하드웨어 설계, 다양한 Tool을 이용한 소프트웨어 설계, Host System의 응용프로그램 개발로 구성되며, Host System으로는 WPAN Platform을 탑재한 휴대폰을, 통신 방식으로는 블루투스를 적용한다.
게이트 산화막 가장자리에 Air-cavity를 가지는 새로운 구조의 다결정 실리콘 박막 트랜지스터
이민철,정상훈,송인혁,한민구,Lee, Min-Cheol,Jung, Sang-Hoon,Song, In-Hyuk,Han, Min-Koo 대한전기학회 2001 전기학회논문지C Vol.51 No.3
We have proposed and fabricated a new poly-Si TFT employing air-cavities at the edges of gate oxide in order to reduce the vertical electric field induced near the drain due to low dielectric constant of air. Air-cavity has been successfully fabricated by employing the wet etching of gate oxide and APCVD (Atmospheric pressure chemical vapor deposition) oxide deposition. Our experimental results show that the leakage current of the proposed TFT is considerably reduced by the factor of 10 and threshold voltage shift under high gate bias is also reduced because the carrier injection into gate insulator over the drain depletion region is suppressed.
사면체요소와 육면체요소를 이용한 삼차원 단조 시뮬레이션 결과의 비교 및 검증
이민철(Min Cheol Lee),백종파(Jong Pa Baek),전만수(ManSoo Joun) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this paper, we simulate a rotor pole cold forging process by a forging simulator with both tetrahedral and hexahedral element capabilities and compare the predictions obtained by the two approaches with the experiments. Hexahedral element capability runs manually while tetrahedral element capability runs automatically with help of an intelligent remeshing technique. It is shown that the tetrahedral element capability can give quite accurate solution if assisted by the intelligent remeshing technique even though the tetrahedral element itself is not theoretically and numerically clear.
생맥산 및 평위산 추출물의 위장관 운동 조절 효능에 관한 연구
이민철 ( Min Cheol Lee ),박진령 ( Jin Ryeong Park ),심지환 ( Ji Hwan Shim ),안태석 ( Tae Seok Ahn ),김병주 ( Byung Joo Kim ) 한방비만학회 2015 한방비만학회지 Vol.15 No.2
Objectives: The purpose of this study was to investigate the effects of Shengmai-san and Pyungwi-san, a herbal product used in traditional Chinese medicine, on gastrointestinal (GI) motility in mice. Methods: The in vivo effects of Shengmai-san and Pyungwi-san on GI motility were investigated by measuring the intestinal transit rates (ITRs) using Evans blue in normal mice and in mice with experimentally induced GI motility dysfunction (GMD). GMD was induced by injecting acetic acid or streptozotocin intraperitoneally. Results: In normal Institute of Cancer Research mice, ITRs were significantly and dosedependentlyincreased by Shengmaisan (0.01∼1 g/kg) and Pyungwi-san (0.01∼1 g/kg). The ITRs of acetic acid induced peritoneal irritation model and streptozotocin-induced diabetic model mice were significantly reduced compared to normal mice, and these reductions were significantly and dose-dependently inhibited by Shengmai-san (0.01∼1g/kg) and Pyungwi-san (0.01∼1g/kg). Conclusions: These results suggest that both Shengmai-san and Pyungwi-san are a good candidate for the development of a prokinetic agent that may prevent or alleviate GMD.
이민철(Min-cheol Lee),정석환(Suk-hwan Chung),권영삼(Young-sam Kwon),조주현(Ju-hyun Cho),전만수(Man-soo Joun) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
We developed a three-dimensional power metallurgy process simulator for die compaction and sintering analyses, called PMsolver3D. The simulator is based on the continuum models for die compaction and sintering process. The theories were given in detail with emphasis on the constitutive models. We adopted the tetrahedral mesh system to increase the applicability and automate the simulation including remeshing. Of course, we have the optional capability of hexahedral elements. Typical simulation examples of only die compaction analysis, only sintering analysis and the coupled analysis of die compaction and sintering were given, which shows the applicability and versatility of the developed program PMsolver3D.
이민철(Min Cheol Lee),전만수(ManSoo Joun) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this paper, we apply a forging simulator to automatic simulation of a connecting-rod forging process and compare its results with others found in the literature. The process information comes from the distributed examples of DEFORM3D. The process is fully automatically simulated using the tetrahedral element capability of AFDEX3D, developed by the authors. Our results are compared with the results found from the related literature, already simulated using DEFORM3D by other researchers. The comparison shows that our results are relatively excellent especially in terms of mesh quality on which the solution accuracy depends mainly.